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송태훈(T. H. Song),이현준(H. J. Lee),Jiang Jun,허선철(S. C. Huh),박원조(W. J. Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
It is known that the high-frequency induction hardening treatment is effective as surface hardening. the strength of this method is that make control the surface layer depth. In this study, carbon steel (SMS3C) was induction-hardened and adjusted to have three different surface hardness levels through the tempering process. The effect of induction hardening and tempering process were investigated as wear test and facture toughness test. At wear test, zirconia (ZrO2) ball was used as a relative wear material and ball-on-disk test was applied for searching wear properties. The results showed that friction coefficient and wear rate decreased with increasing surface hardness in the 50N. But the other condition of load were shown differently. and at accompanied the fracture toughness test, the results showed that as the hardening layer is as deeper K<SUB>IC</SUB> increased.
금속기 복합재료 제조를 위한 예비성형체의 압축강도 평가
송태훈(T. H. Song),이현준(H. J. Lee),박원조(W. J. Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Preforms of Metal Matrix Composite were made from aluminum borate whisker. And two inorganic binder which SiO₂ sol and Al₂O₃ sol were used to make preform and then it were sintered in 1000℃, 1050℃ and 1100℃. The binding ability of the binder has influence on the compressive strength of the preform. The compressive strengths and status of adhesions of those preform were examined were investigated. The result of the compressive strength depending on the kinds of inorganic binders, amount of inorganic binders and the sintering temperatures.
SM53C강의 고주파열처리 후 인장특성 및 평면변형률 파괴인성평가에 관한 연구
임만배(M. B. Lim),전현배(H. B. Jeon),송태훈(T. H. Song),박원조(W. J. Park) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The purpose of this study is to investigate the effect of induction surface hardened on the tensile strength and fracture toughness of SM 53C steel. The tensile strength behaviour of it was estimated by the induction hardening and tempering treatment. The strength and fracture toughness values decreased with increasing of the induction hardening depth. It was observed from the SEM observation on the deformed specimen that the stretch zone width was showed in the fracture surface by the all specimen. Therefore, elastic plastic fracture toughness values could not be valid that induction hardening has martensite structure and this caused compressive residual stress on the test specimen surface.